I need to run water out to our greenhouse which is located behind the stand alone garage and about 80 feet from where the water would exit the house.I'd like both hot and cold water. What material should I use in the trenches? Who long would I have to wait for the hot water and what amount of waste of water would I have? Would a point of service heater be a better choice? Any advice would be appreciated. I think code says only PVC, polyethylene, copper and pex for outside use but people have told me to use CPVC. What's the scoop?Thank you so much!